Any spider will bite if it's hungry. And, they carry nasties. You can get an "infection" from such bites. I did. Got cellulitis. Now, I have to treat even a minor scratch with care and attention. The spider bite was simply itchy and painful to scratch. The infection was serious in nature if not treated properly.

In any case, I try to get them out the door safely as I do with any animal. If I figure I can't, well, there are lots more.